• Nita Dilawar

      Articles written in Bulletin of Materials Science

    • Structure of diamond and diamond like carbon thin films grown by hot-filament chemical vapour deposition technique

      Nita Dilawar Somna Sah B R Mehta V D Vankar

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      Micro-crystalline diamond (MCD) and diamond like carbon (DLC) thin films were deposited on silicon (100) substrates by hot-filament CVD process using a mixture of CH4 and H2 gases at substrate temperature between 400–800°C. The microstructure of the films were studied by X-ray diffraction and scanning electron microscopy. The low temperature deposited films were found to have a mixture of amorphous and crystalline phases. At high temperatures (> 750°C) only crystalline diamond phase was obtained. Scanning electron micrographs showed faceted microcrystals of sizes up to 2µm with fairly uniform size distribution. The structure of DLC films was studied by spectroscopic ellipsometry technique. An estimate of the amount of carbon bonds existing insp2 andsp3 form was obtained by a specially developed modelling technique. The typical values ofsp3/sp2 ratio in our films are between 1·88–8·02.

    • A low cost laser-raman spectrometer

      A K Bandyopadhyay Nita Dilawar Arun Vijayakumar Deepak Varandani Dharambir Singh

      More Details Abstract Fulltext PDF

      A Jobin Yvon-Spex (HR640) monochromator with a notch filter (514·5 nm) and Ar+ ion laser has been used to set up a low cost laser Raman spectrometer. The selection and setup of the various optical components used in the present work has been solely carried out in our laboratory. The calibration of the monochromator was established from the studies of various standard mercury lines and the obtained data fitted with the reported data. Raman signals have been recorded for a number of samples e.g. diamond, ruby, carbon tetrachloride (CCI4), benzene (C6H6) and ethanol (C2H5OH). The obtained results are found to be in excellent agreement with the reported values for these materials in the literature.

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      Posted on July 25, 2019

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